9808118081 has 4 divisors (see below), whose sum is σ = 9968906964. Its totient is φ = 9647329200.

The previous prime is 9808118077. The next prime is 9808118083. The reversal of 9808118081 is 1808118089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2116828081 + 7691290000 = 46009^2 + 87700^2 .

It is a cyclic number.

It is not a de Polignac number, because 9808118081 - 2² = 9808118077 is a prime.

It is a super-2 number, since 2×9808118081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9808118083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80394350 + ... + 80394471.

It is an arithmetic number, because the mean of its divisors is an integer number (2492226741).

Almost surely, 2^9808118081 is an apocalyptic number.

It is an amenable number.

9808118081 is a deficient number, since it is larger than the sum of its proper divisors (160788883).

9808118081 is a wasteful number, since it uses less digits than its factorization.

9808118081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160788882.

The product of its (nonzero) digits is 36864, while the sum is 44.

The square root of 9808118081 is about 99035.9433791591. The cubic root of 9808118081 is about 2140.5656990654.

The spelling of 9808118081 in words is "nine billion, eight hundred eight million, one hundred eighteen thousand, eighty-one".